After experiencing increasing conflict in the home, a social worker calls and schedules a therapy meeting. A 24-year-old, his sister, his mother, and the mother's live-in boyfriend are asked to attend the therapy meeting. Who is the 'client' who will be treated during this session?

The correct answer is B: The entire family. In family therapy, the unit of treatment is the family as a whole, not just individual members. By involving all family members, the therapist can address dynamics, communication patterns, and relationships that contribute to the conflict. Focusing on just one individual (A) may not address underlying family issues. Including only the 24-year-old and his mother (C) may neglect the sister and the boyfriend, missing key perspectives. Involving only the sister, mother, and 24-year-old (D) leaves out the boyfriend and may not provide a comprehensive understanding of the family dynamics.